Internal to the shock strut are the _________(中心凸轮), metering pi

Internal to the shock strut are the _________(中心凸轮), metering pin, and ______(限流孔组件).

A.lug, orifice;

B.centering cam, drill;

C.orifice assemblies, centering lug;

D.centering cam,orifice assemblies;

正确答案是D